Why is my Bali Blue Slimer Acropora Coral turning green or brown instead of blue?

Acropora yongei shifts color with spectrum, nutrients, and stability. Aim for strong blue/UV-heavy lighting (high PAR), nitrate 2–10 ppm and phosphate 0.03–0.08 ppm, with very stable alkalinity. Excess nutrients push brown; ultra-low nutrients wash it out. New frags and recent dips often look dull for weeks. Reduce yellow spectrum, keep trace elements balanced, and avoid rapid changes—consistent conditions bring the blue back.

How do I prevent base recession and shadowing in this fast-branching acro?

It encrusts, then shoots vertical branches that can shade the base. Give high, turbulent flow, mount at a slight angle to spread light, and periodically prune inner branches to open pathways. Avoid crowding with other SPS. Ensure PAR reaches the base (raise colony if needed). Stable alkalinity and moderate nutrients help tissue at the base resist die-off.

After fragging, it produced heavy slime—can that affect the tank?

Yes. The slime can irritate neighbors and cause a temporary skimmer surge. Frag outside the display, rinse frags in clean saltwater, and discard slime water. Run fresh carbon and increase aeration for 24 hours. A small water change helps if the event was large. Provide strong, random flow around the colony to clear mucus and prevent stagnation.

What causes tip burn or sudden tissue loss in Acropora yongei?

Common triggers are alkalinity spikes under intense light, abrupt temperature swings, and low flow around branch tips. Keep alk tightly stable (about 7.5–8.5 dKH), match new saltwater parameters, and ramp PAR changes over 1–2 weeks. If tips burn, reduce light slightly, correct alk, and improve flow. For RTN/STN, frag healthy sections ahead of the die-off and stabilize conditions immediately.

TSA Bali Blue Slimer Acropora Coral

Acropora SPS

Overview

Bali Blue Slimer Acropora Coral displays slender, blue-green branching stalks with a smooth, slime-coated surface. Acropora yongei is a small-polyp stony coral that forms upright branches and prefers strong light and high, turbulent water flow. It is photosynthetic through symbiotic algae, and occasional microplankton feeding can support growth and color. Place high on stable rockwork with room for growth, keep distance from aggressive corals, and maintain stable calcium and alkalinity.

Quick Facts

Care Difficult

Lighting High

Flow High, turbulent

Placement High

Temperament Semi-aggressive (fast-growing; allow 3–6 inches spacing)

Recommended Parameters

Temp 76–80°F

pH 8.1–8.4

Salinity 1.025–1.026

Calcium 420–450 ppm

AlkAlkalinity 7.5–8.5 dKH

Magnesium 1280–1350 ppm

Feeding photosynthetic (primary), microplankton, phytoplankton, zooplankton, rotifers, copepod nauplii, bacterioplankton, coral-specific powdered foods (e.g., Reef Roids), amino acid supplements

Care & Placement

Bali Blue Slimer Acropora Coral (Acropora yongei) thrives in strong, stable reef conditions with high light and brisk, chaotic flow. Target 250–400 PAR under LEDs or T5/halide; acclimate to light over 1–2 weeks using reduced intensity or mesh to avoid bleaching. Provide high, random flow to keep polyps clean and prevent detritus buildup; aim returns or wavemakers to create alternating currents rather than a constant jet. Place high in the rockwork with 3–4 inches of space for upward, branching growth and to avoid shading neighbors. Keep away from aggressive LPS with long sweepers; compatible with most reef-safe fish but avoid coral-nipping angels and butterflyfish.Maintain stable parameters: temperature 75–78°F (24–26°C), salinity 1.025–1.026, pH 8.1–8.4, alkalinity 8.0–9.5 dKH, calcium 420–460 ppm, magnesium 1300–1400 ppm, nitrate 2–10 ppm, phosphate 0.03–0.08 ppm. Test alkalinity and pH often (daily to every few days) and automate dosing for alk/Ca/Mg if possible; swings commonly trigger tissue recession. Feed fine particulate foods 1–3 times weekly (rotifers, reef roids, phytoplankton) and consider low-dose amino acids; don’t overfeed—this coral prefers clean but not sterile water. Dip and inspect new frags for pests (AEFW, red bugs); quarantine when possible. Mount securely with epoxy or glue, ensure good flow around the base to prevent die-off from shading. Troubleshooting: pale color suggests too little nutrients or too much light; browning indicates excess nutrients or low light; receding tips or base point to alkalinity or temperature instability.

FAQ

Frequently Asked Questions

About the TSA Bali Blue Slimer Acropora Coral

Why is my Bali Blue Slimer Acropora Coral turning green or brown instead of blue?

Acropora yongei shifts color with spectrum, nutrients, and stability. Aim for strong blue/UV-heavy lighting (high PAR), nitrate 2–10 ppm and phosphate 0.03–0.08 ppm, with very stable alkalinity. Excess nutrients push brown; ultra-low nutrients wash it out. New frags and recent dips often look dull for weeks. Reduce yellow spectrum, keep trace elements balanced, and avoid rapid changes—consistent conditions bring the blue back.
How do I prevent base recession and shadowing in this fast-branching acro?

It encrusts, then shoots vertical branches that can shade the base. Give high, turbulent flow, mount at a slight angle to spread light, and periodically prune inner branches to open pathways. Avoid crowding with other SPS. Ensure PAR reaches the base (raise colony if needed). Stable alkalinity and moderate nutrients help tissue at the base resist die-off.
After fragging, it produced heavy slime—can that affect the tank?

Yes. The slime can irritate neighbors and cause a temporary skimmer surge. Frag outside the display, rinse frags in clean saltwater, and discard slime water. Run fresh carbon and increase aeration for 24 hours. A small water change helps if the event was large. Provide strong, random flow around the colony to clear mucus and prevent stagnation.
What causes tip burn or sudden tissue loss in Acropora yongei?

Common triggers are alkalinity spikes under intense light, abrupt temperature swings, and low flow around branch tips. Keep alk tightly stable (about 7.5–8.5 dKH), match new saltwater parameters, and ramp PAR changes over 1–2 weeks. If tips burn, reduce light slightly, correct alk, and improve flow. For RTN/STN, frag healthy sections ahead of the die-off and stabilize conditions immediately.

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